I agree with Marty....
... I don't think the hesitation is due to the prop. Why not try a test flight with some 100LL. Even if you don't like the idea of using 100LL full time, one tank won't hurt anything.
Your pitch setting sounds about right for now. Only change it if you find the blades do not match.
How is the vibration level? Do you feel any shaking in the stick? If you do, consider getting a dynamic prop balance. It made a huge difference in my airplane.
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
“Master Pilot” Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2018.